The Leviathans Add-on for Stellaris has 12 achievements.
Lead the non-aligned powers to victory against an awakened empire
Destroy a wraith
Hatch the egg
Take a trophy from a stellar being
Restore an ancient warship
Birth a new universe
Destroy an enclave
Uncover the secrets of an ancient fortress
Defeat a horrifying invader
Support the Artisan Troupe for 10 years
Purchase a rare resource from the Traders
Recruit a scientist from the Curators